Grip cage grab for deep-well pumps



Dec. 4, E928. Bf@

A. B. MccAuN GRIP CAGE GRAB FOR DEEP WELL PUMPS Filed Jan. 24. 1928 .A A l: lz: "m,

lpatented Dice. t, 1928.

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insana Y ALBERT BBYAN McCain, on nnwnnio, CALIFORNIA.

n entr enen en /iB BB DEEP-WELL ruivirs.

Application led January 24, 1928!Seria1 No. 249,031.

Thisinventicn relates to a general class of devices known as well fishingr tools'.

lt-'has for object to providea positive `when the tool contacts v*with the object the hooks or prongs will be moved into an engaging position.

it well known in the 'oil industry that one` of the principal processes oi. Vnducing production from oil wells is to' introduce a pump therein, which consists of a working barrel attached toa string 'of tubing, lowered into the well to a depth below the oil level, Within this Working barrel there is the usual plunger device used in this form of pump and at the head thereof is the working valve, consisting of a cage with three openings spaced equidistant, within which cage there is a hardened ball, aceiiiately engaging the valve seat. This working valve is attached to a stringlof sucker rods by a short threaded. .stein engaging the lowerend of the sucker rod.

One of the most frequent accidents that occur to this pumping device in its operation is the breaking or snapping off of thisshort engaging stein, which necessitates the pullin of the sucker rod, and upon the failure of the ordinary fishing devices now known it is necessary to undertake'the. costly Vand arduous operation of diseiigaging and pulling the en-`-v tire string of oil pumping tubing. `Theordinary cage spearviiow known to the industry is uncertain in itsoperation and seldom successfully engages the pumping cage because of the lack of guidance. This uncertainty in fishing operations together with the costly resultant operation ofpulling the tubing where it fails, is entirely eliminated by the device which is the subject of this invention.

lt is therefore a furtlierobject of this invention to provide a tool ofthe character de-r scribed wliich by reason of its design and construction is particularly adapted to recover the cagolieretofore referred to in the use of deepwell pumps.`

lVit-h the above and other objects in view, the invention further includes the following novel features and details of constructions, which are hereinafter more fully described and illustrated in the accompanying drawing.

In the drawing: y vFig. 1` is a vertical sectional view of a grip cage grab constructed in accordance with this invention, one of the prongs being shown partlyin sections.

FigQ is a bottom view. of the tool. Fig. 3 isaview similar to Fig; 1, showing theprongs released andthe grabs in an en gaging position.

Referring now' more particularly to the accompanying drawing in which like numerals designate like parts throughout the several views., the ninnerall llf designates the hollow cylindrical casin which is open at the bottom and into which a pully rod 5 is removably suspendedon the screw threaded connection G. The' pull rod* has a protruding head on which rests' the internal shoulders 8 of the ing block 12 provided with a recess 13 in itv bottom which is adapted to receive the top portions 14 of the prongs 9. Attached to the lockino` block 12 b i a threaded con nectioirlA a1 5. vis a trip rod 1b, which upon striking the ob ject or cage is utilized to iaisethe locking blockagainst the action of the coil spring 17 which encircles the pull rod 5. lli/Then' the locking block 12 is raised the upper part of the prongs 9 are forcedoutwardly bythe action of the resilient lingers 18 connected to the prongs 9 at the shoulder portions 8 and slidably bearing against the pull rod 5. riheA device then assumes the position shown in Fig. 3. K e Y w rllhis device is particularly adapted to grip a pump cage which has been omitted from in order that the working parts of the' invention may be more clearly shown. rEhe working cage of the pump is a triangular oh` ject` having shoulders which will be received in the recesses 19 Vof the casing, and between these shoulders there are three openings, into which the grabsv 10 will spring when the trip ro'd 16 has encountered the cage.

In order to set this'device for furtherl use, pressure should 4be exerted on pull rod 16 to raise the locking block 12, and the part 14 of the prongs 9 are pushed inwardly against the pull rod through the holes Q0 releasing the pressure on the trip rod and thereby allow- El l1 in position and slide over the head of the working cage oi the pump, which is also held rigidly in piace by the pumping barrel.

illhen the gripping pronos are released, they untailingly engage the cage, and no other lishing device that is used in pumping tubing is known to embrace this feature.

lfhis saine device may be used iii pulling a sanded pump, where the standing valve is rendered inoperative, by the use of a leftlianded tlu'ead on the lower coupling oit the sucker rods, disengaging such rods and applythe grab as heretofore deseribed. This method of procedure does away with annoyance, cost and loss of time vand oil in what in the tradeisknown; as a wet job in pulling tubing. used in the saine manner with like effect in the event the Oarbutt rod, which is attached to the lower standing valve or cage ofthe pump becomes broken or disconnected. In this ease, the `working barrel is withdrawn from the well along with a string of sucker rods and the device lowered into plaee, tripped andattached on the lower valve or cage in the same manner as before.

Having now more particularly describedthe preferred form oit this invention, what is Claimed as new is:

l. A grip cage grab consisting of a hollow casingA open at one end, a pull rod removably' suspend-ed within thecasing, said pull rod being provided with a protrudinghead, gripping prongs having shoulders resting on' the protrudinghead of the pull rod, a locking block slidable upon the pull rod and: adapted This device may also be further to engage trie prongs, and means for raising the locking bloolr to release the. gripping prongs.

2f. A gripeage'grab Consisting of a hollow casing open at one end, a pull rod removably suspended within'the casing, said pull rod being provided with a protruding head, gripping prongs having shoulders resting on said protruding head ot the pull rod, a locking block slidable on the pull rod and adapted to engage the prongs, a means engaging the loclriiigibloclr to hold it in operative position and means for raising the locking bleek torelease the gripping prongs. f

3. A grip cage grab consisting of a hollow casingopen at one end, a pull rod removably suspended .within the casing, said pull rod being provided with a protruding head, gripping prongs having shoulders resting on said protruding head ot thev pull rod, a looking block slidable over the pull `rod and adapted to engage 'the prongs. a spring encircling the pull rod and maintaining the locking block4 in operative position, a. trip rod eXtending below the easing `and-connected to the locking block, said trip rod adapted to, raise said locking block upon contacting with anobject, and means for forcing said gripping prongs into an engaging position.

4. A grip cagegrab consisting of a hollow easing open at one end, a pull rod removably suspended within the casing. said pull rod being provided with a protruding head, gripping piongshaving shoulders resting on said protruding, head oil the pull rod,` a locking block having recess inthe bottom and slidable on thepull rod, said recess being adapted to receive-the top of theprongs and maintain them in inoperative position, means foriraising the locking block to release the gripping prongs and ymeans for forcing thegripping prongs into an. engagingxposition.

ALBERT BRYAN MeoaiN. 

